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IMPROVEMENT IN GAUGE-COURS I'OB. BOI'IERS.-

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TO ALL WHOM I'I4 MAY CONCERN:

Beit known that I, W. G. THOMAS, `ot Centralimin the county of Columbia, and State or Pennsylvania, have invented s. new and improved Gauge-Cock; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the nrt to malte and use the same, reference being hud to the accompanying drawings, forming part ot' this specification.

The drawing represents a. longitudinal section through the centre of the eo'ek.

This invention relates to nn improvement in gauge-cocks for steam-boilers, and consists in the construction ofthe same in several removable parts. so that the certain parts which may require repaircan be-taken off and repaired while there is steam inthe beller. v

The boiler and water are shown in red lines, and to the former is screwed the general part, A, by vmeans'et a screw-thread, o, cut on a reduced portion of the sume. e e is another thread, cut on the outer reduced end of the same part A, to which is screwed the part B, having a shoulder, D', fitting tightly against asimilar fshoulder, C, on the part A. The bore of the part A is slightly conical, and contains a valve-seat, h, tted tightly therein. A valve-seat, d, tit-s the bore of thepnrt B in a similar manner. E is a screw, provided with a valve, H, for seating into the open end'of the vulve-seat a, as shown. This valve H has a thread eut on its reduced end, securing the valve to the inner` end-of the screw E, as shown. O is an aperture for the escupe of Vthe steam or water, and opens into the bore of the part Il. The valvev D hns n stem, s, which rests against the valve H, and the length of said stem is such that the valve D is seated lonly when the screw E is withdrawn to a certainv distance, or the part B containing the said screw removed altogether, for cleaning or repair. VThe valve D then-.will seat, and prevent lthe escape of steam or water. By screwing in the screw E, the valve II. Vseats in a, thus shutting oli' the escape ofthe stenm or wnter. By unscrewing E, the valve H admits the steam or water to the'aperture O, and the'pressure ot' the same against valve D causes'it to follow up, and keeps its stem, s, in contact with thevalvc H, though the said valve does not seat until the screw E is withdrawn to a. grenter distance than is necessary for the mere operation of trying the gauge.

I am aware that a gauge-cock has been patented by J. Broughton, (No. 5I,418,) which is runde in two pnrts, andv screwed together, similarly t0 mine, the object being to get at thc valve for grinding, when it was-worn. In this gauge, the inventor contemplated the detachment of the outer part only, when there was no steam in the boiler, as it obviously could not be unscrewed for repair when there was. p

My improvement provides for the removal ofthe outer part, B, at any time, and when there is steam in the boiler the engineer can still use the part A, and its valve, D, as e gauge-cock, for by pressing on the stem '3, whichwill protrude from the bore of ythe part A when Bis unscrewed, the gauge can be tried with perfect facility. v

In my gauge-cock the valve D-will not be likely to become worn, for it is seldom in contact with its sent. When the valve H is worn, the screw E cnn be removed, and the valve H reiitted or substituted by a new one in a short time. The -seat .a can alsobe easily replaced by ano-ther. t

Other advantages of simplicity'and cheapness, combined with those before stated, render this gauge-cock a perfectand, desirable attachment to all boilers, but especially those in which high-pressure steam is generated. In the western cities, the gauge-cocks become frequently choked up with `dirt, and cannot, with the gauge as heretofore made, be cleaned while there is steam in the boiler.

I claim as new, and desire to secure by Letters Patent- The combination of the screw E with thc valves D and H and parte B and C, substantially as shown und described.

WILLIAM G. THOMAS.

Witnesses:

#1.. S. BONER, WILLIAM Tonner. 

